So the in-house legal team acknowledged that a Pirelli test would allow the usage of the 2013 car. So even if this was informal, it has been established that it effectively is a loophole allowed by the FIA. This can't be denied anymore or be put aside. It isn't like Mercedes tried to go around the testing rules, saying it is a pirelli test and the FIA not happy about it; the FIA clearly stated they can do that!"Basically Mercedes made the request to run the 2013 car to the FIA, Charlie Whiting then had an exchange with the in-house legal team at the FIA and it's fascinating to hear the email reponse that came back from Sebastian Barnard, who's the FIA's legal advisor. It goes along the lines of 'in my view any such testing could not actually be undertaken by competitors, it would be argued that this was done by Pirelli. Would we be able to take this position?'
"The response from Sebastian Barnard was 'yes we could take this position, it is not an undertaking from the competitor'. So on the face of it if that's some advice that's been given out there it does seem to suggest that there was this potential loophole that it could be a Pirelli test governed by their commercial contract with F1 and it wouldn't involve the competitor Mercedes and they wouldn't be in breach of the regulations."
Furthermore, it also shows it goes beyond charlie whiting. If it is allowed by the FIA department that judges such cases, then you can't put your own decisions aside anymore.